Positioning control method and positioning device
a positioning control and positioning technology, applied in the field of positioning devices, can solve problems such as inability to accurately measure positions, and achieve the effect of reducing power consumption and improving positioning accuracy
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Examples
first example
Outline
[0045]In the swimming mode of the first example, a positioning operation is performed by suppressing use of a received frequency (doppler frequency) and using a pseudo range (code phase) among pieces of measurement information obtained as a reception result of a GPS satellite signal. Specifically, a position calculation is performed by using a least square method which solves simultaneous equations, in which a position of GPS receiver 20 (or, a position of positioning device 1) or a timepiece error is used as a variable and which is based on pseudo ranges regarding a plurality of GPS satellites, in an approximately estimating manner by an iterative operation.
Baseband Processing Circuit Portion
[0046]FIG. 2 is a configuration diagram of a baseband processing circuit portion 24A in the first example. According to FIG. 2, the baseband processing circuit portion 24A includes a baseband (BB) processing unit 100A and a BB storing unit 200A.
[0047]The BB processing unit 100A is realiz...
second example
[0059]Next, a second example will be described. In the second example, the same constitutional elements as those of the first example are denoted by the same reference numerals and detailed description thereof will be omitted.
Outline
[0060]In the swimming mode of the second example, a positioning operation in which the pseudo range (code phase) is used and the received frequency (doppler frequency) is not used, among measurer e t information obtained as a reception result of the GPS satellite signal, i s performed. Specifically, although the position calculation using the Kalman filter is performed, the position calculation is executed using a speed obtained from a temporal change of a position, which is a result of the positioning operation performed in the most recent past, instead of a speed obtained from the doppler frequency, in a prediction step of the Kalman filter. That is, Kalman filter processing using the pseudo range is executed using a given movement distance per unit ti...
third example
[0071]Next, a third example will be described. In the third example, the same constitutional elements as those of the first example and the second example are denoted by the same reference numerals and detailed description thereof will be omitted.
Outline
[0072]In the swimming mode of the third example, the positioning operation is performed by using only data of the received signal when the positioning device 1 is present in the air (above water surface) and by not using data of the received signal when the positioning device 1 is present under the water (below water surface)
Configuration
[0073]FIG. 7 is a configuration diagram of a baseband processing circuit portion 24C of a third example. According to FIG. 7, the baseband processing circuit portion 24C includes a BB processing unit 1000, a sample memory 300, and a BB storing unit 200C.
[0074]The sample memory 300 includes two banks each of which is able to store data of the received signal as much as 20 milliseconds.
[0075]The BB pro...
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